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Did you install through bootcamp, parallels or both. Either way I suggest you use Bootcamp to play any modern games. I have used parallels for older games, like command and conquer zero hour and they work mostly okay.

There should not be a problem at all through bootcamp. If there is then uninstall the game and try again. See if other games do the same thing.
 
My screen is flickering when I game on bootcamp. I installed Win7 through parallels, but it's flickering so much that I can't play it. Any suggestions?

What game? The game could be overriding your refresh rate to 75 or similar causing flickers.
 
I get the same thing when I play games (only have the Crysis Maximum pack). It randomly happens, i.e. no matter what kind of action is going on. Anyone know how to fix it? Is it defective hardware?
 
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